I don't think it talks about their bankroll specifically but it may be possible to infer a ballpark amount based on their current maximum bets.
I think it is. Here's what he said, followed by some probably very inaccurate guesses.
This chart indicates that if a casino wants to have a less than 0.001% risk of ruin, they must have a bankroll of more than 8000x the maximum bet on a single number.
[...]
0.001% is small, but it's not infinitesimal. In order to make our true risk of ruin truly infinitesimal, we have the ability to lower the maximum bet as necessary. We prefer not to rely on this mechanic though, which is why we shoot for a very low risk of ruin without it.
[...]
0.001% is small, but it's not infinitesimal. In order to make our true risk of ruin truly infinitesimal, we have the ability to lower the maximum bet as necessary. We prefer not to rely on this mechanic though, which is why we shoot for a very low risk of ruin without it.
The max bet on a single number in roulette is 5 BTC. To have less than a 0.001% risk of ruin the house would need to have 8000 times that, ie. 40k BTC.
They aim for "very low risk of ruin". And "0.001% is small". Does that mean they have more than 8000x, since they want very small, but 0.0001% is only small?
Either way, 40k BTC seems a reasonable ballpark figure.
I'm not sure if you would need 40k for each game you offer. I don't think so though. If you ran a roulette game where everyone had to bet on '1' all the time, you'd still need 40k BTC to achieve the same risk of ruin. Then you could run another game where everyone bet on '2', and not need an extra 40k BTC to be safe. So let's say they have a 40k float.
libertaad registered at the forums in December 2011 when BTC were trading below $4 each. Even in June 2012 when bitZino launched they were still only around $5 each. 40k BTC then would have cost around $200k, but it's likely the casino has built up its bankroll over the time it has been running. The max bets have grown over time, so they probably started with a lot less than that.
Like I said, I'm just guessing based roughly on what the risk-of-ruin post said.